The best replacement for 2500k is 3570k.

The best alternatives to 2500k are rated as following:
★★★★★  3570k
★★★  2600k
★★★  4670k
★★★  3770k
★★★  2550k
★★★  4770k
★★  8350
★  6300
★  3750k
★  2700k
★  i7 2600k
★  4570
★  i5 3570k
★  8320
★  3000k
★  4570k
★  4930k
★  3550
★  3450
★  3470
★  fx 6300
★  3350p
  2400
  i5 4670k
  4670
  i5 2500
  1100t
  3570k for overclocking
  950
  4440
  i7 920

Your alternative for 2500k is not listed? Suggest!
Speaking about 2500k, one probably shouldn't forget about gtx 770.

Other search terms related to 2500k and their ratings are:
★★★★★ gtx 770
★★★★★ z77
★★★★ 7950
★★★ 7970
★★ 780
★★ h60
★★ gtx 780
★ 6850
★ 7850
★ 1600
★ h100
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